$veri='<div class="img-container">
<div class="preview single" style="top: 0px; left: -5px; display: none;"><img src="r10.net/resim1.jpg" style="width: 630px; height: 450px;"></div>
<div class="preview dual" style="top: 0px; left: -40px; display: block;"><img src="r10.net/resim2.jpg" longdesc="xg" style="width: 350px; height: 450px;"><img src="x" longdesc="x" style="width: 294px; height: 450px;"></div>
<div class="preview dual" style="top: 0px; left: 10px; display: none;"><img src="r10.net/resim3.jpg" longdesc="x" style="width: 300px; height: 450px;"><img src="x" longdesc="x" style="width: 338px; height: 450px;"></div>
<div class="preview single" style="top: 2.5px; left: 141px; display: none;"><img src="r10.net/resim4.jpg" longdesc="x" style="width: 338px; height: 450px;"></div>
<div class="zoom single" style="top: 0px; left: -6px; display: none;"><img src="x" longdesc="x" style="width: 953px; height: 680px;"></div>
			<div class="loader" style="opacity: 0.5; display: none;"><img src="/website/file/img/ani_loader_big2.gif" xtyle="position:absolute; left:-20px; top:0px;"></div>
			<a href="#" class="browse-prev">&nbsp;</a>
			<a href="#" class="browse-next">&nbsp;</a>
			<a href="#" class="zoom s"></a>
		</div>';

preg_match_all('#<div class="preview(.*?)"><img src="(.*?)"(.*?)"></div>#', $veri, $resimler);
print_r($resimler[2]);